Need test: fix sub-folder HTML for FILE converter

src/var/lib/tyto/program/check.py

@@ -475,7 +475,7 @@ def check_headers(post_header):
         post_err = True
 
       if not post_err:
-        web_link = '<a class="%s" href="%s" '%('file', web_uri) + \
+        web_link = '<a class="%s" href=".%s" '%('file', web_uri) + \
                    'target="%s" title="%s">%s</a>'%(
                    '%s', file_alt, file_name
                    )